Identify a line, a plane or curved surface from the following :
(a) Side of a rectangle (b) Surface of ruler
(c) Floor of room (d) Surface of football.

When the following angles are rotated through 360^(@) , at what angles will there be rotational symmetry in the following : (a) Square (b) Rectangle (c ) Equilateral triangle (d) Paralleogram (e) Regular hexagon (f) Regular Octagon

State the reason for the following observatins recorded from the surface of moon. sky appers dark and

Give here are some figures . Classify each of them on the basis of the following (a) Simple curve (b) Simple closed curve , (c ) Polygon (d) Convex polygon (e ) Concave polygon

State the reason for the following observatins recorded from the surface of moon. rainbow is never formed.

State the reason for the following observations recorded from the surface of moon.sky appears dark

State the reason for the following observations recorded from the surface of moon rainbow is never formed.

A point charge +Q is placed at the centre O of an uncharged hollow spherical conductor of inner radius 'a' and outer radius 'b'. Find the following: The magnitude and sign of the charge induced on the inner and outer surface of the conducting shell.